ENGINE - 5.0L - NEW TORQUE-TO-YIELD CYLINDER HEAD BOLT KIT AND NEW PROCEDURES - SERVICE TIP
Publication Date: FEBRUARY 13, 1995
1988 THUNDERBIRD 1988-1991 CROWN VICTORIA 1988-1995 MUSTANG 1991-1993 THUNDERBIRD
1988 COUGAR 1988-1990 TOWN CAR 1988-1991 GRAND MARQUIS 1988-1992 MARK VII 1991-1993 COUGAR
1988-1995 BRONCO, ECONOLINE, F-150-350 SERIES
In 1992, the type of cylinder head bolts used on the 5.0L engines was changed to the torque-to-yield bolts. Depending on the build date of the engine, the 1992 model year engines came with either torque-to-yield bolts or standard torque, not a combination of the two (2). In 1993, torque-to-yield bolts were used on all 5.0L engines.
Refer to the following text for proper bolt identification, usage and torque specifications.
The two (2) types of bolts being used are physically different. Refer to Figure 1.
Figure 1 - Article 95-3-10
The standard torque bolt is a non-flanged hex head bolt.
The torque-to-yield bolt is a flanged head bolt.
The two (2) types of bolts may be used on any of the 5.0L engines.
The bolts must be all the same style on each cylinder head.
DO NOT USE BOTH TYPES OF CYLINDER HEAD BOLTS ON ONE (1) CYLINDER HEAD. EACH CYLINDER HEAD MUST HAVE ALL OF ONE (1) TYPE OF RETAINING BOLT: STANDARD TORQUE OR TORQUE-TO-YIELD.
The torque-to-yield cylinder head bolts will be available only in a packaged kit (F3ZZ-6065-E). The kit will contain the following:
Five (5) 7/16-14x3.94 Bolts
Five (5) 7/16-14x2.49 Bolts
One (1) 3/8-16x7/16-3.93 Stud
One (1) Instruction Sheet (I.S. #6605)
Some applications use a various quantity of studs for fastening of items to the cylinder head.
FOR THE NON-FLANGED STANDARD HEX HEAD BOLTS, TIGHTEN IN TWO (2) STEPS AS FOLLOWS:
Tighten all bolts in sequence (Figure 2) to 75-88 N-m (55-65 lb-ft).
Figure 2 - Article 95-3-10
Tighten all bolts in sequence (Figure 2) to 88-98 N-m (65-72 lb-ft).
FOR ALL TORQUE TO YIELD HEX HEAD BOLTS, TIGHTEN IN THREE (3) STEPS AS FOLLOWS:
Tighten all bolts in sequence (Figure 2) to 34-47 N-m (25-35 lb-ft).
Tighten all bolts in sequence (Figure 2) to 61-75 N-m (45-55 lb-ft).
Tighten all bolts in sequence (Figure 2) an additional 1/4 turn (85-95 degrees).
WHEN THE CYLINDER HEAD BOLTS HAVE BEEN TIGHTENED FOLLOWING THESE PROCEDURES, IT IS NOT NECESSARY TO RETIGHTEN THE BOLTS AFTER EXTENDED OPERATION.
TORQUE-TO-YIELD CYLINDER HEAD BOLTS MUST BE REPLACED WITH NEW BOLTS. DO NOT REUSE TORQUE-TO-YIELD BOLTS. TORQUE-TO-YIELD BOLTS MAY ONLY BE USED ONE (1) TIME.